Progression isn't bad, and I like the mood a lot. Piece sounds a lot brighter once the higher-pitched elements come in at :16. The clap sample is a bit generic, but overall the sound design is pretty good and the instruments certainly blend well. The piece is very repetitive, but I'm also concerned about the mixing. You may have overdone the reverb a tad, but I also think you could stand to use some stricter equalization to limit to make the piece sound a little sharper. The hits that start at 1:20 strike me as being especially taxing on the mix - you might try to filter out a lot of interfering frequencies there. I also would've liked to see you add more variety during the last minute or so of the piece. The bass line that comes in at 2:58 seemed to be a lit arbitrary. Still, you clearly have a good sense of harmony and progression. Keep at it, man! ;)